What does efficacy mean?

What does efficacy mean?

• A. Efficacy
• B. Infectiousness
• C. Virulence
• D. Immunity

Answer: (A)

Efficacy is about how well an intervention works under ideal, controlled conditions—its maximum potential to prevent disease or achieve the intended outcome as shown in clinical trials. It’s typically reported as how much disease is reduced in the treated group compared with a control group. This differs from infectiousness, which is how easily a pathogen spreads; virulence, which is how severe the disease is; and immunity, which is the protection against disease itself. For example, a vaccine with high efficacy produces a large drop in disease cases among vaccinated people in the trial, reflecting its strongest possible protective effect under study conditions.

Efficacy is about how well an intervention works under ideal, controlled conditions—its maximum potential to prevent disease or achieve the intended outcome as shown in clinical trials. It’s typically reported as how much disease is reduced in the treated group compared with a control group. This differs from infectiousness, which is how easily a pathogen spreads; virulence, which is how severe the disease is; and immunity, which is the protection against disease itself. For example, a vaccine with high efficacy produces a large drop in disease cases among vaccinated people in the trial, reflecting its strongest possible protective effect under study conditions.